1 files changed, 469 insertions, 0 deletions

diff --git a/sound/hda/hdac_sysfs.c b/sound/hda/hdac_sysfs.c
new file mode 100644
index 000000000..62a9615dc
--- /dev/null
+++ b/sound/hda/hdac_sysfs.c
@@ -0,0 +1,469 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sysfs support for HD-audio core device
+ */
+
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/device.h>
+#include <sound/core.h>
+#include <sound/hdaudio.h>
+#include "local.h"
+
+struct hdac_widget_tree {
+	struct kobject *root;
+	struct kobject *afg;
+	struct kobject **nodes;
+};
+
+#define CODEC_ATTR(type)					\
+static ssize_t type##_show(struct device *dev,			\
+			   struct device_attribute *attr,	\
+			   char *buf)				\
+{								\
+	struct hdac_device *codec = dev_to_hdac_dev(dev);	\
+	return sysfs_emit(buf, "0x%x\n", codec->type);		\
+} \
+static DEVICE_ATTR_RO(type)
+
+#define CODEC_ATTR_STR(type)					\
+static ssize_t type##_show(struct device *dev,			\
+			     struct device_attribute *attr,	\
+					char *buf)		\
+{								\
+	struct hdac_device *codec = dev_to_hdac_dev(dev);	\
+	return sysfs_emit(buf, "%s\n",				\
+			  codec->type ? codec->type : "");	\
+} \
+static DEVICE_ATTR_RO(type)
+
+CODEC_ATTR(type);
+CODEC_ATTR(vendor_id);
+CODEC_ATTR(subsystem_id);
+CODEC_ATTR(revision_id);
+CODEC_ATTR(afg);
+CODEC_ATTR(mfg);
+CODEC_ATTR_STR(vendor_name);
+CODEC_ATTR_STR(chip_name);
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	return snd_hdac_codec_modalias(dev_to_hdac_dev(dev), buf, 256);
+}
+static DEVICE_ATTR_RO(modalias);
+
+static struct attribute *hdac_dev_attrs[] = {
+	&dev_attr_type.attr,
+	&dev_attr_vendor_id.attr,
+	&dev_attr_subsystem_id.attr,
+	&dev_attr_revision_id.attr,
+	&dev_attr_afg.attr,
+	&dev_attr_mfg.attr,
+	&dev_attr_vendor_name.attr,
+	&dev_attr_chip_name.attr,
+	&dev_attr_modalias.attr,
+	NULL
+};
+
+static const struct attribute_group hdac_dev_attr_group = {
+	.attrs	= hdac_dev_attrs,
+};
+
+const struct attribute_group *hdac_dev_attr_groups[] = {
+	&hdac_dev_attr_group,
+	NULL
+};
+
+/*
+ * Widget tree sysfs
+ *
+ * This is a tree showing the attributes of each widget.  It appears like
+ * /sys/bus/hdaudioC0D0/widgets/04/caps
+ */
+
+struct widget_attribute;
+
+struct widget_attribute {
+	struct attribute	attr;
+	ssize_t (*show)(struct hdac_device *codec, hda_nid_t nid,
+			struct widget_attribute *attr, char *buf);
+	ssize_t (*store)(struct hdac_device *codec, hda_nid_t nid,
+			 struct widget_attribute *attr,
+			 const char *buf, size_t count);
+};
+
+static int get_codec_nid(struct kobject *kobj, struct hdac_device **codecp)
+{
+	struct device *dev = kobj_to_dev(kobj->parent->parent);
+	int nid;
+	ssize_t ret;
+
+	ret = kstrtoint(kobj->name, 16, &nid);
+	if (ret < 0)
+		return ret;
+	*codecp = dev_to_hdac_dev(dev);
+	return nid;
+}
+
+static ssize_t widget_attr_show(struct kobject *kobj, struct attribute *attr,
+				char *buf)
+{
+	struct widget_attribute *wid_attr =
+		container_of(attr, struct widget_attribute, attr);
+	struct hdac_device *codec;
+	int nid;
+
+	if (!wid_attr->show)
+		return -EIO;
+	nid = get_codec_nid(kobj, &codec);
+	if (nid < 0)
+		return nid;
+	return wid_attr->show(codec, nid, wid_attr, buf);
+}
+
+static ssize_t widget_attr_store(struct kobject *kobj, struct attribute *attr,
+				 const char *buf, size_t count)
+{
+	struct widget_attribute *wid_attr =
+		container_of(attr, struct widget_attribute, attr);
+	struct hdac_device *codec;
+	int nid;
+
+	if (!wid_attr->store)
+		return -EIO;
+	nid = get_codec_nid(kobj, &codec);
+	if (nid < 0)
+		return nid;
+	return wid_attr->store(codec, nid, wid_attr, buf, count);
+}
+
+static const struct sysfs_ops widget_sysfs_ops = {
+	.show	= widget_attr_show,
+	.store	= widget_attr_store,
+};
+
+static void widget_release(struct kobject *kobj)
+{
+	kfree(kobj);
+}
+
+static struct kobj_type widget_ktype = {
+	.release	= widget_release,
+	.sysfs_ops	= &widget_sysfs_ops,
+};
+
+#define WIDGET_ATTR_RO(_name) \
+	struct widget_attribute wid_attr_##_name = __ATTR_RO(_name)
+#define WIDGET_ATTR_RW(_name) \
+	struct widget_attribute wid_attr_##_name = __ATTR_RW(_name)
+
+static ssize_t caps_show(struct hdac_device *codec, hda_nid_t nid,
+			struct widget_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "0x%08x\n", get_wcaps(codec, nid));
+}
+
+static ssize_t pin_caps_show(struct hdac_device *codec, hda_nid_t nid,
+			     struct widget_attribute *attr, char *buf)
+{
+	if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
+		return 0;
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_PIN_CAP));
+}
+
+static ssize_t pin_cfg_show(struct hdac_device *codec, hda_nid_t nid,
+			    struct widget_attribute *attr, char *buf)
+{
+	unsigned int val;
+
+	if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
+		return 0;
+	if (snd_hdac_read(codec, nid, AC_VERB_GET_CONFIG_DEFAULT, 0, &val))
+		return 0;
+	return sysfs_emit(buf, "0x%08x\n", val);
+}
+
+static bool has_pcm_cap(struct hdac_device *codec, hda_nid_t nid)
+{
+	if (nid == codec->afg || nid == codec->mfg)
+		return true;
+	switch (get_wcaps_type(get_wcaps(codec, nid))) {
+	case AC_WID_AUD_OUT:
+	case AC_WID_AUD_IN:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static ssize_t pcm_caps_show(struct hdac_device *codec, hda_nid_t nid,
+			     struct widget_attribute *attr, char *buf)
+{
+	if (!has_pcm_cap(codec, nid))
+		return 0;
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_PCM));
+}
+
+static ssize_t pcm_formats_show(struct hdac_device *codec, hda_nid_t nid,
+				struct widget_attribute *attr, char *buf)
+{
+	if (!has_pcm_cap(codec, nid))
+		return 0;
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_STREAM));
+}
+
+static ssize_t amp_in_caps_show(struct hdac_device *codec, hda_nid_t nid,
+				struct widget_attribute *attr, char *buf)
+{
+	if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_IN_AMP))
+		return 0;
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_AMP_IN_CAP));
+}
+
+static ssize_t amp_out_caps_show(struct hdac_device *codec, hda_nid_t nid,
+				 struct widget_attribute *attr, char *buf)
+{
+	if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_OUT_AMP))
+		return 0;
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_AMP_OUT_CAP));
+}
+
+static ssize_t power_caps_show(struct hdac_device *codec, hda_nid_t nid,
+			       struct widget_attribute *attr, char *buf)
+{
+	if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_POWER))
+		return 0;
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_POWER_STATE));
+}
+
+static ssize_t gpio_caps_show(struct hdac_device *codec, hda_nid_t nid,
+			      struct widget_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_GPIO_CAP));
+}
+
+static ssize_t connections_show(struct hdac_device *codec, hda_nid_t nid,
+				struct widget_attribute *attr, char *buf)
+{
+	hda_nid_t list[32];
+	int i, nconns;
+	ssize_t ret = 0;
+
+	nconns = snd_hdac_get_connections(codec, nid, list, ARRAY_SIZE(list));
+	if (nconns <= 0)
+		return nconns;
+	for (i = 0; i < nconns; i++)
+		ret += sysfs_emit_at(buf,  ret, "%s0x%02x", i ? " " : "", list[i]);
+	ret += sysfs_emit_at(buf, ret, "\n");
+	return ret;
+}
+
+static WIDGET_ATTR_RO(caps);
+static WIDGET_ATTR_RO(pin_caps);
+static WIDGET_ATTR_RO(pin_cfg);
+static WIDGET_ATTR_RO(pcm_caps);
+static WIDGET_ATTR_RO(pcm_formats);
+static WIDGET_ATTR_RO(amp_in_caps);
+static WIDGET_ATTR_RO(amp_out_caps);
+static WIDGET_ATTR_RO(power_caps);
+static WIDGET_ATTR_RO(gpio_caps);
+static WIDGET_ATTR_RO(connections);
+
+static struct attribute *widget_node_attrs[] = {
+	&wid_attr_caps.attr,
+	&wid_attr_pin_caps.attr,
+	&wid_attr_pin_cfg.attr,
+	&wid_attr_pcm_caps.attr,
+	&wid_attr_pcm_formats.attr,
+	&wid_attr_amp_in_caps.attr,
+	&wid_attr_amp_out_caps.attr,
+	&wid_attr_power_caps.attr,
+	&wid_attr_connections.attr,
+	NULL,
+};
+
+static struct attribute *widget_afg_attrs[] = {
+	&wid_attr_pcm_caps.attr,
+	&wid_attr_pcm_formats.attr,
+	&wid_attr_amp_in_caps.attr,
+	&wid_attr_amp_out_caps.attr,
+	&wid_attr_power_caps.attr,
+	&wid_attr_gpio_caps.attr,
+	NULL,
+};
+
+static const struct attribute_group widget_node_group = {
+	.attrs = widget_node_attrs,
+};
+
+static const struct attribute_group widget_afg_group = {
+	.attrs = widget_afg_attrs,
+};
+
+static void free_widget_node(struct kobject *kobj,
+			     const struct attribute_group *group)
+{
+	if (kobj) {
+		sysfs_remove_group(kobj, group);
+		kobject_put(kobj);
+	}
+}
+
+static void widget_tree_free(struct hdac_device *codec)
+{
+	struct hdac_widget_tree *tree = codec->widgets;
+	struct kobject **p;
+
+	if (!tree)
+		return;
+	free_widget_node(tree->afg, &widget_afg_group);
+	if (tree->nodes) {
+		for (p = tree->nodes; *p; p++)
+			free_widget_node(*p, &widget_node_group);
+		kfree(tree->nodes);
+	}
+	kobject_put(tree->root);
+	kfree(tree);
+	codec->widgets = NULL;
+}
+
+static int add_widget_node(struct kobject *parent, hda_nid_t nid,
+			   const struct attribute_group *group,
+			   struct kobject **res)
+{
+	struct kobject *kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
+	int err;
+
+	if (!kobj)
+		return -ENOMEM;
+	kobject_init(kobj, &widget_ktype);
+	err = kobject_add(kobj, parent, "%02x", nid);
+	if (err < 0) {
+		kobject_put(kobj);
+		return err;
+	}
+	err = sysfs_create_group(kobj, group);
+	if (err < 0) {
+		kobject_put(kobj);
+		return err;
+	}
+
+	*res = kobj;
+	return 0;
+}
+
+static int widget_tree_create(struct hdac_device *codec)
+{
+	struct hdac_widget_tree *tree;
+	int i, err;
+	hda_nid_t nid;
+
+	tree = codec->widgets = kzalloc(sizeof(*tree), GFP_KERNEL);
+	if (!tree)
+		return -ENOMEM;
+
+	tree->root = kobject_create_and_add("widgets", &codec->dev.kobj);
+	if (!tree->root)
+		return -ENOMEM;
+
+	tree->nodes = kcalloc(codec->num_nodes + 1, sizeof(*tree->nodes),
+			      GFP_KERNEL);
+	if (!tree->nodes)
+		return -ENOMEM;
+
+	for (i = 0, nid = codec->start_nid; i < codec->num_nodes; i++, nid++) {
+		err = add_widget_node(tree->root, nid, &widget_node_group,
+				      &tree->nodes[i]);
+		if (err < 0)
+			return err;
+	}
+
+	if (codec->afg) {
+		err = add_widget_node(tree->root, codec->afg,
+				      &widget_afg_group, &tree->afg);
+		if (err < 0)
+			return err;
+	}
+
+	kobject_uevent(tree->root, KOBJ_CHANGE);
+	return 0;
+}
+
+/* call with codec->widget_lock held */
+int hda_widget_sysfs_init(struct hdac_device *codec)
+{
+	int err;
+
+	if (codec->widgets)
+		return 0; /* already created */
+
+	err = widget_tree_create(codec);
+	if (err < 0) {
+		widget_tree_free(codec);
+		return err;
+	}
+
+	return 0;
+}
+
+/* call with codec->widget_lock held */
+void hda_widget_sysfs_exit(struct hdac_device *codec)
+{
+	widget_tree_free(codec);
+}
+
+/* call with codec->widget_lock held */
+int hda_widget_sysfs_reinit(struct hdac_device *codec,
+			    hda_nid_t start_nid, int num_nodes)
+{
+	struct hdac_widget_tree *tree;
+	hda_nid_t end_nid = start_nid + num_nodes;
+	hda_nid_t nid;
+	int i;
+
+	if (!codec->widgets)
+		return 0;
+
+	tree = kmemdup(codec->widgets, sizeof(*tree), GFP_KERNEL);
+	if (!tree)
+		return -ENOMEM;
+
+	tree->nodes = kcalloc(num_nodes + 1, sizeof(*tree->nodes), GFP_KERNEL);
+	if (!tree->nodes) {
+		kfree(tree);
+		return -ENOMEM;
+	}
+
+	/* prune non-existing nodes */
+	for (i = 0, nid = codec->start_nid; i < codec->num_nodes; i++, nid++) {
+		if (nid < start_nid || nid >= end_nid)
+			free_widget_node(codec->widgets->nodes[i],
+					 &widget_node_group);
+	}
+
+	/* add new nodes */
+	for (i = 0, nid = start_nid; i < num_nodes; i++, nid++) {
+		if (nid < codec->start_nid || nid >= codec->end_nid)
+			add_widget_node(tree->root, nid, &widget_node_group,
+					&tree->nodes[i]);
+		else
+			tree->nodes[i] =
+				codec->widgets->nodes[nid - codec->start_nid];
+	}
+
+	/* replace with the new tree */
+	kfree(codec->widgets->nodes);
+	kfree(codec->widgets);
+	codec->widgets = tree;
+
+	kobject_uevent(tree->root, KOBJ_CHANGE);
+	return 0;
+}